I have this computer i bought:

I would like to upgrade the ram to 2gb, and see how many hds i could add to it, i see 2 slots on the mother board but im unsure it it can handle 4 hds at 250gb or 300 gb each... is there a limit for computers on how much hd space you can have? Also what is you're opinion of it? Would it be faster and better then what the original specs are, i already added a 250gb maxtor hard drive.